MA XUEJING/CHINA DAILY
Editor s Note: Aging populations have far-reaching impacts on East Asian economies. In particular, China faces some serious demographic challenges. What should China do to overcome those challenges? Three experts share their views on the issue with China Daily.
Historically, demographics have been a slow-moving variable. But the East Asian economies－especially China, Japan, and the Republic of Korea－have flipped so fast from rapid population growth to decline that they practically have whiplash.
As a planned economy, China was once obsessed with expanding its population. But, in 1957, economist Ma Yinchu published The New Theory of Population and cautioned that this trend would soon begin to undermine China s economic development. Though the government initially criticized his theory, Chinese leaders eventually took his warnings to heart, encouraging family planning as a way to promote economic growth.
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activating invasion and metastasis
Cancer biologists have known for a long time that the genes involved in developing cancer control cellular processes like these, and these processes are very ancient ones. Just because these processeas are ancient, however, does not mean that Davies is correct. His first line of argument is that cancer is found in virtually all multicellular organisms have cancer, which is true but basically irrelevant. Then he argues:
The evidence that cancer is an evolutionary regression goes beyond the ubiquity of the disease. Tumors, says Davies, act like single-celled organisms. Unlike mammalian cells, for example, cancer cells are not programmed to die, rendering them effectively immortal. Also, tumors can survive with very little oxygen. To Davies and his team, which includes Australian astrobiologist Charles Lineweaver and Kimberly Bussey, a bioinformatics specialist at ASU, that fact supports the idea that cancer emerged somewhere between 1 billion and 1